Speaking about the new film, Zac said: "It's the first time I've ever watched a movie I'm in and at the end I'm like, 'OK! I didn't check my watch once!'"

The 21-year-old actor also revealed he annoyed his parents when he was growing up by singing all the time.

He added to Nylon Guys magazine: "I was constantly singing. I would hear things on the radio and just be about to spit them out instantly, with perfect memorization and tone. My parents were like, 'Shut up. Please stop singing. It's annoying.'"

Zac admits he is too embarrassed to discuss his success as a Disney actor with any of his friends.

He said: "I try not to look at all of it. You can't enjoy or celebrate it - it's not a real thing. The face on the lunchbox and sh*t - you can't share that with your friends."